Stamping press



Patented July 5, 1938 I 7 UNITED STATES PATENT OFFICE STAMPING PRESS Application September 14, 1935, Serial No. 40,514

11 Claims.

My'invention relates to stamping presses.

More particularly my invention relates to an adjustable, self-conforming mounting of the table or other work holder of a stamping press, particularly adapted for impressing articles such as pencils, penholders, handles of hammers, of axes, of lawn-mowers, etc., which type of articles, usually formed of wood, vary in relative dimensions to an extent which yields unsatisfactory results in the use of table mountings or other work holders heretofore devised.

My mounting of the main table or sub-table or like-work holder of a stamping press is also advantageous for impressing articles of other formations and characteristics, as when impressing simultaneously upon the same article two impressions varying in area of impression and other characteristics whereby substantially visually equivalent impressions are effected at both impressions.

More particularly my invention comprises mounting means for the main table or sub-table, or other work holder, on toggle means extending in or substantially parallel to the plane of the movement of the impression-imparting element, such toggle means being provided with adjustable means for setting the minimum angle of break of the toggle means, and adjustable means, resiliently tensioned, for regulating the extent of yield of the mounting means during the stage'of impressing.

Further features and objects of the invention will be more fully understood from the following detail description and the accompanying drawing, inwhich Fig; 1 is a front elevation ofa conventional type of stamping press but equipped with my improved'work holding, i. e., table mounting means;

Fig.2 is a detail sectional view on line 2--2 of Fig, 1;

Fig. 3 is aside elevation of essential parts shown in Fig. 1, indicating the relative movements of the work holder, i. e., table and its mounting, in self-adjustment in the stage of impressing a non-uniformly dimensioned article such as the illustrated axe handle.

Referring to the embodiment of the invention typified by tbedrawing, Fig. illustrates at E9 any suitable form of stamping mechanismv comprising in essence a ram Illa, at the lower face of which is a die holder II adapted to receive one or more dies I2. The type of stamping mechanism indicated in the drawing is usually provided with automatic means for the-feeding of the stamping medium,- usually leaf in ribbon form, advantageously of so-termed roll leaf, the same comprising a carrier of paper or equivalent, on the effective face of which is a layer of the material to be impressed upon the article to be stamped. Such material may be genuine or s imitation gold, genuine or imitation silver, etc. A practical form of stamping leaf comprises such paper carrier bearing the stamping material, and an intermediate layer of unctuous material, releasable under elevated temperature, had as by up means of an electrical or other suitable heater, indicated at I3.

With such or other approved type of stamping mechanism, my invention provides a work holder, usually a main table M suitably supported 515 by a sub-table I5, and mounting means for the sub-table comprising self-adjustable elements, advantageously toggle elements arranged to effect uniformity of depth and other essential qualities of impression irrespective of variations (p0 of physical dimension or relative hardness of the article to be impressed and irrespective of variant areas of impressions.

An efficient form of my invention is had, as illustrated in the drawing, by mounting 'the'effective work holder l4, stationary relative to a sub-table I5, and the latter self-adjustably upon a base such as a pedestal I6, by spaced and substantially parallelly operating toggle or equivalent elements Il, I8, having their respective 3,0 lower eared ends suitably pivoted in bearing ears I9, 20, shown in substantial alignment with one another upon the top plate IGa of the pedestal I6, and their respective upper eared ends suitably pivoted in bearing ears or equivalent 2I,,22, suitably depending, and mounted in alignment with one another, from. the lower face of the sub-table I5. In the illustrated embodiment, the main table M for holding the work to be impressed is adjustable in vertical relation to the 040 sub-table l5 by means of a screw-threaded shaft 23 or equivalent, rotatably secured in a boss 14a on the under side of the main table I l, the desired effective adjustment being had by relative rotation of such screw-threaded shaft 23 anda45 locked by means of a set-screw 24 or equivalent. The positioning of the main table I4, as will be understood, is set generally in accordance with the vertical dimension of the article to be impressed, the article having been laid upon the i350 table I4, to facilitate the adjustment of the position of the main table I4.

Such toggles ll, I8, or equivalent, are provided with suitable regulatable resilient urgingmeans represented by the respective coil springs 25,; 26,4155

one end of each of which may be fixedly secured, as in an apertured ear 21, projecting from a fixed part, such as the head 28, secured to or extending integrally from the top plate 16a of the pedestal Hi, the free end 25a, 26a, of the respective springs 25, 26, being attached to a suitable tension regulating device, viz., a threaded rod 25b, 26b, each having a recessed aperture at one end for respectively receiving such spring ends 25a, 26a, such threaded rods 25b, 26b, passing through threaded apertures of the central pivot portion of the respective toggle, a detail construction of which appears more fully hereinafter. Such tension regulating rods 2%, 261) are shown adjustable by means of the respective knurled adjusting nut 25c, 260.

Further, I provide suitable means for limiting the minimum angle of break of each toggle or equivalent means for preventing assumption of dead-center status thereby. The stated means is here exemplified by a threaded stud 29 for the toggle H, such threaded stud being received within a mating threaded recess in the fixed head 28, and adjusted as by placing a suitable tool in the opening 25a in the free end of such threaded stud, the face of such free end engaging a projection Ila carried by the toggle l1. Similar construction for adjusting the angle of minimum break of the toggle i8 or equivalent is provided, as is illustrated in Fig. 1, like parts being designated by the reference character 30 and corresponding suffixes. Such adjustable minimum break of angle of the respective toggle elements sets the same at proper normal position in correspondence to the variant vertical olimensions of the article to be stamped, preparatory for the downward movement of the ram of the press.

A commercially satisfactory form of toggle is iiiustrated in Fig. 2, corresponding to the toggle l8 shown in Fig. 1, and comprises complementary upper toggle elements l8b, I82), mounted on opposite ends of a suitable pivot pin passing through the bearing ear 22, the lower endsof such toggle elements being pivoted to a central pivot stud 3|, to which is also pivotally mounted the. upper ends of the lower toggle element 580, through whose lower apertured end passes a pivot stud mounted in the oppositely disposed bearing ears 20, 20, secured to the top plate 16a of the pedestal l6.

Such toggle arrangement exposes the central portion of the central pivot stud 3 I, at which central portion, see 3la, the above stated threaded aperture is tapped for the reception and adjusted setting of the threaded stud 26b or equivalent. A like or equivalent arrangement may be had for the complementary toggle element corresponding to the toggle element of the embodiment shown in Fig. 1.

Fig. 3 depicts an adjusted positioning of the essential parts of Fig. 1, in the operation of stamping a non-uniformly vertically dimensioned article such as the handle 32 of an axe, which is usually convergently tapered toward its head end 32a. For such type of work, 32, the toggle element i7 is adjusted to a lesser angle or" break than the toggle element l8, as appears from the comparative illustrated settings, and accordingly upon the downward movement of the ram Illa of the press, carrying the two dies l2, ii, the effective faces of the dies I2, l2, are brought into simultaneous engagement with the respective face portions of the axe handle where the im- Jpressions are tobe affixed. Thestamping medium, i. e., ribbon, has been omitted in the show- Fig. 3 indicates the stage of initial engagement of the dies l2, l2, with the axe handle 32, and upon further downward movement of the press ram and therewith of the dies l2, l2, the relief die faces of the latter and therewith the stamping medium gradually enter the face of the axe handle, attended by yielding downward operations of the toggle elements l1, against the opposing force exerted by their respective springs 25, 26, the differential setting of the toggle elements ll, E8, in correspondence to the difierence in vertical dimensions of the Work at the two areas of impression, effecting a corresponding self-accommodation of the work holder, resultin effecting uniformity of depth and quality of impression. Such advantageous results are also derived for variant areas impression at two or more locations on the face of the work, effected at simultaneous operations.

Whereas I have described my invention by reference to specific forms thereof, it will be understood thatmany changes and modifications may be made without departing from the spirit of the invention.

I claim: 1

1. The combination with a stamping device,of Work-holder means comprising stationary support, a work-holder member, yieidable means for setting said work-holder member in adjusted supported relation to said stationary support, said yieldable means comprising spacially interrelated toggle elements and adjustable means for setting the angle of initial break of said toggle means.

2. The combination with a stamping device, of Work-holder means comprising a stationary support, a work-holder member, yieldable means for setting said work-holder member in adjusted supported relation to said stationary support, said yieldable means comprising spacially interrelated toggle elements, adjustable means for setting the angle of initial break of said toggle means, and adjustable resilient means for'controlling the resistive yielding force exerted by said toggle means.

3. The combination with a stamping device, of a stationary support, a work-holder member, spacially interrelated and interaligned sets of toggle elements respectively controlling the plane of the effective face of said work-holder member relative to said stationary support, manually adjustable means for setting the angle of initial break of the respective sets of toggle elements, and manually adjustable resilient means for regulating the resistive yieldin forces respectivelyexerted by said sets of toggle elements.

4. The combination with a stamping device; of a stationary support, a work-holder member, spacially interrelated and interaligned sets of toggle elements respectively controlling the plane of the effective face of said work-holder member relative to said stationary support, manually adjustable means for setting the angle of initial break of the respective sets of toggle elements, and manually adjustable resiiient means for regulating the resistive yielding forces respectively exerted by said sets of toggle elements, each of said adjustable resilient means including an element screw=threadedly carried by a movable part of associated set of toggle elements.

5. In work holder means for presses which include a work holder member yieldaply mounted on a supporting structure, independently yieldable means spaced apart mutually between the work holder member and the supporting structure and connecting the one with the other, and resilient supports for said yieldable means normally maintaining the work holder member at a predetermined level with respect to the supporting structure when the press is not in operation, said independently yieldable means yielding differentially at the stage of impression of the press.

6. In work holder means for presses which include a work holder member yieldably mounted on a supporting structure, independently yieldable means spaced apart mutually between the work holder member and the supporting structure and connecting the one with the other, and resilient supports for said yieldable means nor 'mally maintaining the Work holder member at a predetermined level with respect to the supporting structure when the press is not in operation, said independently yieldable means yielding differentially at the stage of impression of the press, the said work holder member comprising a subtable fixed with respect to the yielding means and a main table adjustably mounted on the subtable.

7. In work holder means for presses which include a work holder member yieldably mounted. on a supporting structure, independently yieldable means mutually spaced substantially pa"- allel with the length of the work holder member and the supporting structure and positioned therebetween, resilient means normally support ing said yieldable means for maintaining the work holder member at a predetermined level with respect to its supporting structure when the press is not in operation, said independent-1.! yieldable means being disposed in parallel along the lengths of the work holder member and the supporting structure and yielding differentially at the stage of impression of the press.

8. In work holder means for presses which. in clude a work holder member yieldably mounted on a supporting structure, toggles spaced apart between the work holder member and the supporting structure and connecting the one with the other, resilient means normally supporting said toggles at a position ofi dead-center for maintaining the work holder member at a predetermined level with respect to the supporting structure when the press is not in operation, said toggles yielding differentially at the stage of impression of the press.

9. In work holder means for presses which include a work holder member yieldably mounted on a supporting structure, toggles spaced apart and disposed in operative alignment substantially parallel with the length of the work holder member and the supporting structure and positioned therebetween to connect one with the other, resilient supporting means associated with said toggles for normally maintaining the work holder member at a predetermined level with respect to its supporting structure when the press is not in operation, said toggles yielding differentially at the stage of impression of the press, and adjustable means for setting the initial angle of break of the said toggles.

10. In work holder means for presses which include a work holder member yieldably mounted on a supporting structure, toggles spaced apart mutually and operatively aligned between the work holder member and the supporting structure substantially parallel with the length thereof and serving to connect the one with the other, resilient means normally supporting said toggles at a position oiT dead-center for maintaining the work holder member at a predetermined level with respect to the supporting structure when the press is not in operation, said toggles yielding differentially substantially parallel with the lengths of the work holder member and the sup port ng structure, at the stage of impression of the press.

11. In work holder means for presses which include a work holder member yieldably mounted on a supporting structure, toggles spaced apart in operative alignment and substantially parallel with the length of the work holder member and the supporting structure and positioned therebctween to connect the one with the other, resilient means associated with said toggles normally supporting said toggles at a position off dead-centcr for maintaining the work holder member at a predetermined level with respect to its supporting structure when the press is not in operation, said toggles yielding differentially at the stage of impression of the press, the said work holder member comprising a sub-table fixed with respect to the yieldable means, and a main table adjustably mounted on the sub-table.

ARTHUR M. WICKVVIRE, JR. 

